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Hydrogen Seal Upgrades

Hydrogen Seal Upgrades

Mechanical Dynamics & Analysis (MD&A) upgraded a customer’s hydrogen seals for a 7FH2 generator located in Colombia. Many units in the combined cycle setup, which can be comprised of two MS7001FA gas turbines and a D11 steam turbine, are also equipped with 7FH2 generators. Many of these machines have unbolted babbitted hydrogen seals. If there’s […]

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Investing in Journal Bearing Ball Ring Repairs

MD&A continues to invest in new facilities that enable us to expand our quality service and repair offerings. For example, our Bearings, Seals and Hydraulics division recently acquired a new horizontal bore machine at its Euclid, OH plant to enable delivery of precision ball ring repairs on journal bearings. The horizontal bore machine, shown in […]

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DFLP Rotor Straightening and Machining

DFLP Rotor Straightening

Mechanical Dynamics & Analysis was contracted to straighten and machine a double flow low pressure (DFLP) rotor from a 3,600 rpm, 103 MW combined cycle power generating unit. The rotor forging arrived with both shaft ends bent. The Turbine end shaft end was bent and found to have a 0.007” total indicator runout (TIR) at […]

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Generator Rotor Stub Shaft Repair

Generator Rotor Stub Shaft Repair

Mechanical Dynamics and Analysis (MD&A) was retained by a utility to perform a stub-shaft repair of a generator rotor collector-end shaft. The customer reported that the generator rotor had suffered a collector ring failure and also a ground to the main shaft. Major arcing and heat damage occurred to the generator rotor forging shaft. The […]

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Diaphragm Dishing Repair

Diaphragm Dishing Repair

Mechanical Dynamics and Analysis inspected and repaired a stage 15 dished diaphragm. The unit was an upgraded 297.5 MW D6 frame unit. The stage 15 diaphragm was found to be dished downstream by approximately 0.215”. MD&A’s Turbine-Generator Repair Facility performed a diaphragm dishing repair to the stage 15 diaphragm by cutting out the old weld, […]

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